Illustration is an important part of graphic design. The artwork is created by vector software such as Adobe Illustrator and is scalable to any size as it is not compiled of pixels (like photographs) but points and paths which are curved or shaped according to mathematical expressions and therefore do not become pixelated (blocky) at larger sizes.
For this reason logos are always designed in vector format so that they can be scaled up for use in signage if required. In addition illustrations are also used to complement a design or when creating a visual theme. Some examples of vectors available from AdvanceDesign are shown below..